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Financial Instrument - Risk Management and Fair Value - Summary of Gearing Ratio (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of risk management strategy related to hedge accounting [abstract] |  |  |  |
Total debt (note 18) | $ 1,174,581 | $ 1,184,132 |  |
Less: non-restricted cash and cash equivalents and short-term investments | (943,900) | (814,689) |  |
Net debt | 230,681 | 369,443 |  |
Total equity | 1,905,612 | 1,636,753 | $ 1,390,520 | $ 1,893,866
Total capitalization | $ 2,136,293 | $ 2,006,196 |  |
Gearing ratio | 10.80% | 18.40% |  |

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